______ trees are cut down in the forests every year.
#36306
A
Thousand
B
Thousands
C
Thousands of
D
Thousand of
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The train is going _______ the tunnel. Then it will go ______to the center of the city.
#36769
A
through; towards
B
through; straight 
C
across; towards
D
across; straight
John often goes to school _____.
#41114
A
by foot
B
on foot
C
on feet
D
by feet